Was Rio+20 a failure of political leadership?

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I was happy to return to Rio, this beautiful city which I have visited several times. Twenty years after the first Earth Summit, I came to Rio, like many people from all over the world, to put the world on a different pathway -- one leading to sustainable development.

But, the leaders gathered here came without an intergenerational vision and they failed to rise to the challenge; they did not break their ties with the old ways of doing things -- ways that are proved to be unsustainable and inequitable.

If the government representatives had heard the heartfelt yearning for change, for a vision of the future that the broad base of men, women -- and even children -- shared during numerous side events, and in the Sustainable Development Dialogues organized by the Brazilian government, perhaps they would have given their negotiators a stronger mandate: A mandate to create the future we want and which the earth needs. Unfortunately these voices were not incorporated into the declaration text and many leave for home frustrated and angry.

I urge those who are disappointed by the lack of urgency and commitment to channel their frustration positively to work on a parallel pathway to fill the gaps left by the Rio text and to deliver the futures we all need.

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I had the pleasure of participating in numerous events during the conference where we discussed the role of women's empowerment in sustainable development, the importance of making real progress on food and nutrition security and the need to improve access to sustainable energy for the poorest.

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Underlying all of these discussions was the importance of upholding human rights and not backsliding on any existing commitments, while striving for a more equitable world.

The Rio declaration does set some important processes in train, like developing Sustainable Development Goals, which address all three dimensions of sustainable development: Environmental, social and economic.

These should be action oriented, aspirational and measurable, so that they complement the Millennium Development Goals. Likewise, processes have been established to strengthen environmental governance at the international level and to make progress on financing for sustainable development.

The current declaration reaffirms the Rio Principles and the Universal Declaration of Human Rights. However, it worries me that negotiations revealed a desire by some to step back from established commitments and principles. The restating of these commitments is therefore considered a success, only because these principles and values were under threat.

Arising from the failure of political leadership here in Rio, our hope is that people everywhere will accept that we all have to take responsibility and mobilize ourselves. Helped by social media and easier communication across the globe, we can make sure that the world we pass on to our children and grandchildren is safe, equitable, prosperous and sustainable.

I was encouraged as I listened to many heads of state at the summit, who stressed their desire for a more concrete outcome. But this desire came too late: They should have engaged earlier in the process, they could have seized the moment and given stronger leadership.

This possibility of a once in a generation moment passed us by and we will regret it. Happily the lack of political leadership was countered by the incredible vitality, determination and commitment of civil society -- from young people, women, trade unions, grassroots communities, faith-based organizations and the private sector.

The legacy of Rio+20 will not just be the text of the Declaration hopefully it will be the mobilization of people to build the future they desire.